Toothbrush



FIG. 1 is a perspective view of a toothbrush, embodying my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back side thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof.

The portion of the toothbrush shown in broken lines is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a toothbrush, as shown and described. 